Sphygmomanometer.



C. H. WASEH.

SPHYGMOMANOMETER.

APPLICATION FILED JULY 21. 1914.

Ll @R99 "mi: COLUMBIA pLANonR/IVII co.. WASHINGTON, n. C.

w ESL m W FINE.

CARL R. W'ASER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR'TO PRECISION THER- IVIOTiIETER 85 INSTRUMENT COMPANY, OIF PHILADELPHIA, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

SPI-IYGMOMANOMETER.

Specification of Letters Patent. Ptntrgd Mgpyg, 1916.

Application filed .Tuly 21, 1914. Serial No. 852,156.

To all whom t nmg/ concern Be it known that I, CARLR. WAsER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania,'ha.ve invented certain Improvements in Sphygmomanometers, of which the following isa specifica tion. v

My invention is `designed to provide a simple, efficient and durable instrument, with parts conveniently made, assembled and dissociated, which will prevent the fluctuation of mercury between the cistern and tube connected therewith and avoid the escape of mercury from the top of the cistern.

In the accompanying drawings, Figure 1 is an elevation of an instrument embodying my improvements; Fig. 2 is a vertical sectional view taken through the cistern as well as the base connecting it with the reading tube; Fig. 3 is a sectional view taken on the line 3 3 of Fig. 2; and Fig. 4 is an irregular sectional view through a coupling.

The instrument, in the form illustrated in the drawings, comprises the case 1 having the lid 2 to the inner surface of which is fixed a tubular steel elbow or fixture comprising the branches 3 and 4 fixed to the lid by the lug 5 containing the elongated hole 6 for the retaining screw 7, the branch 3 being disposed at an angle (suitably of 45 degrees) to the inner surface of the lid 2. A three branch coupling 8, comprising the branch nipple 9 adapted to be frictionally connected with the branch 3, has the branch nipples 10 and 11 on which are frictionally engaged the ends of flexible tubes 12 and 13 respectively, the tube 12 being connected with the pneumatic cuff 14 and the tube 13 being connected with the pump 15. The branch 4 is provided with a collar or flange 16 and with a chamber 17 having an apertured plug 18 screwed therein to retain a fibrous substance 19, such as cotton, in the passage through the fixture. A bottle shaped. steel cistern 20 has a contracted top or neck 21 which receives the lower end of the branch 4, abuts against the collar 16, and is held in place by acoupling 22 which is swiveled on the branch 4 above the collar 16 and screws on the neck 21. An iron or steel base 23 has the threaded socket 24 (into which is screwed the threaded bottom of the cistern 20 against the leather washer 25), the plain socket 26 (in which is cemented the bottom of t'he glass tube 27) and the contracted passage 28 connecting the bottom of the sockets 24 and 26 to establish communication between the bottoms of the parts 20 and 27. A web 29 on the base 23 contains the slot 30 through which a screw 31 passes into the lid, the slots 6 and 30 permitting the vertical adjustment ofthe' mechanism. The tube 27 is fixed to the lid 2 by the clip 32, has a movable section 33 connected therewith, and is provided with a valve 34 for closing it, the section 33 being withdrawn by a longitudinal movement from its connection through the valve with the section 27 to permit the latter to be closed by turning the valve. A scale 35, having the movable section 36, serves to read the surface of the mercury. It will be understood that the sections 33 and 36 are movable to permit the instrument to be inclosed within the lid, the valve 34 having been closed. `While the cotton 19 in the chamber 17 permits air to be forced from the pump 15 through it to the interior of the cistern 20, mercury in this cistern is prevented by the cotton and the restricted passages communicating therewith from flowing back through the branch 4. When mercury is forced by the pressure in the cistern 20 through the contracted passage 28 into the tube 27, the restraining influence of the small passage prevents too rapid flow, surging and fluctuating.

Having described my invention, I claim:

1. In a sphygmomanometer, a metal base containing a passage, a tube fixed to said base in communication with said passage, a cistern fixed to said base in communication with said tube through said passage, a fixture having a passage therethrough in communication with said cistern and a flange thereon forming a bearing for said cistern, and coupling mechanism engaging said flange and cistern together.

2. In a Sphygmomanometer, a fixture having a passage therethrough and a chamber intersecting said passage, a fibrous material in said chamber, an apertured plug adapted to pass air and to hold said fibrous material in said chamber, a cistern connected with said fixture, means for forcing air through said fixture into said cistern, and a tube connected with said cistern.

Ina sphygmomanometer, thecombina-v tlon of a caselhaving a lid, a fixture 'having' a ,passager therethroughy and a .branch `iXed cistern, kand pneumatic meansY connectedv with said'xture through said branch.

4. In a sphygmomanometer, a fixture having branches, a cistern connected With a branch-*of said tixture -a ,tube.,c onnected with sadjcistern, .afpuripye Guti', and means @Qmprsing .a three" .way .coupling Vtor .con-

nesting' sald cui and 'pumpcwth a branch s Ofjsaid fixture,-

" a ,hlig'd lista metalbaSe (hzwng Parallel Sockets 0f dernt .diameters ,connected by a @Directed Passage) .xed' to .Said lid, .a

. metal 'sistem .seated .in the larger of Said Gopiespf this patent may =be Aobtained for sockets and Vfixed to said lid, a glass tube necting said cuff and pump to said fixture.

lIn testimony whereof I have hereunto set y y .Y my 4name this 20th day kof J uly, 1914, in the .In ,a sphygmomanometerfe case .having presence ofthe subscribing Witnesses.

CARL R. VASER. Witnesses:

Jos. G. DENNX; Jr., Y C. N. BUTLER.

vecents each, by addressing the Commissioner ot Patent.

` .Wuhingtomvnc." 

